How To Install Docker on AlmaLinux 9 Server

Docker is a platform that simplifies the deployment and management of applications using container technology by leveraging the Linux kernel. In this article, we will provide a step-by-step guide to installing Docker on your AlmaLinux 9 Server.

Prerequisites

In order to follow this guide, you will need shell access to an AlmaLinux 9 machine with a root privileged user.

Steps to Install Docker on AlmaLinux 9

Step 1

First, switch to the root user using the following command. Unless stated otherwise, all subsequent commands must be executed as the root user.

john@localhost:~ sudo -i

Step 2

Check for available package updates by using the following command.

root@localhost:~ dnf check-update --quiet

Step 3

Add the official Docker repository as follows:

root@localhost:~ dnf config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

Note that Docker does not provide a dedicated repository for AlmaLinux.

However, since AlmaLinux and CentOS are both downstream distributions of Red Hat Enterprise Linux, the CentOS repository can be used on AlmaLinux.

Step 4

Use the following command to install Docker CE:

root@localhost:~ dnf install --assumeyes --quiet docker-ce

Step 5

Start the Docker service and ensure it automatically starts on boot.

root@localhost:~$ systemctl enable --now docker

Step 6

Lastly, test that Docker works by creating a test container using the following command.

root@localhost:~ docker run --rm hello-world

Sample Output:

[root@server ~]# docker run --rm hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
70f5ac315c5a: Pull complete
Digest: sha256:dcba6daec718f547568c562956fa47e1b03673dd010fe6ee58ca806767031d1c
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

Congratulations! You have successfully installed Docker on your AlmaLinux 9 Server.